It IS possible to turn back time.
Or at least to fix a crochet piece which did not turn out the right way.
I have ripped out, right to the first stitch, before; but if most of the piece is good, then that can be very discouraging. I crocheted a shawl/scarf from a free online pattern and started with one yarn then changed to another part way through. I thought they were closer in character than they turned out to be though, and in the end I did not like the first few rows.
I posted an appeal for help to a facebook group I belong to " Make it, wear it (crochet and knitting) " and a reply led me to a Utube video which gave me enough help that I could figure out the rest.
To remove it I first had to be sure the wanted stitches did not unravel. I threaded a cord through each stitch of the first desirable row, cut away the unwanted parts, then pulled a "good" piece of yarn through to replace the cord.
A new summer shawl/scarf. Truly a ta da moment!